The nav element represents a section of a document that links to other documents or to parts within the document itself; that is, a section of navigation links.
any element that can contain flow elements
Not all groups of links on a page need to be in a nav element — only sections that consist of primary navigation blocks are appropriate for the nav element. In particular, it is common for footers to have a list of links to various key parts of a site, but the footer element is more appropriate in such cases.
Uses HTMLElement.